Let x be a random variable that represents white blood cell count per cubic milliliter of whole blood. Assume that x has a distribution that is approximately normal, with mean ? = 6300 and estimated standard deviation ? = 2750. A test result of x < 3500 is an indication of leukopenia. This indicates bone marrow depression that may be the result of a viral infection.   (a) What is the probability that, on a single test, x is less than 3500? (Round your answer to four decimal places.)   What is the probability of x < 3500? (Round your answer to four decimal places.) (c) Repeat part (b) for n

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